In message <CAD6AjGSBfy_RH9J_T2yY32=vqH=19JBeL+gSNB4nN_piJv+16A@mail.gmail.com>, Ca By writes:
On Wednesday, June 17, 2015, William Herrin <bill@herrin.us> wrote:
On Wed, Jun 17, 2015 at 5:38 PM, Ricky Beam <jfbeam@gmail.com <javascript:;>> wrote:
I'll wait for Curran to pop up with various links to reasons why Class E was "abandoned" by ARIN. (short answer: too much broken crap thinks it's multicast!)
Hi Ricky,
You may be confused. ARIN never possessed class E; it's held in reserve by IETF. As much as I enjoy a good ARIN bashing, they and John Curran are quite faultless here.
IIRC, the short answer why it wasn't repurposed as additional unicast addresses was that too much deployed gear has it hardcoded as "reserved, future functionality unknown, do not use." Following an instruction to repurpose 240/4 as unicast addresses, such gear would not receive new firmware or obsolete out of use quickly enough to be worth the effort.
Given how slowly IPv6 is deploying, this
Pardon me. But Apple has at least suggested y'all should be ready for ipv6-only networks, not class E
http://arstechnica.com/apple/2015/06/apple-to-ios-devs-ipv6-only-cell-servic...
http://www.internetsociety.org/deploy360/blog/2015/06/apple-will-require-ipv...
And the source video which is worth watching from start to finish
Well the cell carriers are kind of forcing the issue here for iOS. They want to go IPv6-only and Apple doesn't want to do 464XLAT last I heard (haven't watched the video yet). If all the apps can run in a IPv6 only environment then there is only IPv4 literals in web pages and tethered equipement to worry about so there is less presure to implement 464XLAT. Breaking pages with IPv4 literals may actually be a good thing at this stage. We are 20 years into the migration to IPv6. 15 years of production IPv6 behind us. Most tethered equipment can do IPv6. The only hold outs there are servers that they want to connect to are IPv6 only. Forcing the issue here would also be a good thing. Additionally lots of big companies (FaceBook, Microsoft) are trying to go IPv6 only internally as are data centers. A number of wireline ISP are IPv6 only using DS-Lite to transport IPv4. MAP is a future IPv4 as a service on IPv6 contender.
choice may prove to have been
shortsighted. Had IETF designated class-E as "reserved, future unicast" in 2008 when the issue was debated and asked vendors to update their software to expect 240/4 to be used as unicast addresses, half the problem equipment would already have aged out and we could all be debating whether to make them more RFC-1918 or hand them off to the RIRs.
Regards, Bill Herrin
-- William Herrin ................ herrin@dirtside.com <javascript:;> bill@herrin.us <javascript:;> Owner, Dirtside Systems ......... Web: <http://www.dirtside.com/>
-- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: marka@isc.org